I ran my bottom diffuser just at night when temps were below 70 deg, but that mixed the water column too much with the upper, warmer water. The trout died.

If I get a spare 2 days I'll build the aeration system that I think will solve that problem.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).